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Plastics & Elastomers

Injection Molding in Hyper Drive

SpecialChem / Jan 13, 2007

The PET business as we know it now is only about 30 years old. Concerns about exploding glass bottles with carbonated drinks prompted the two major soft drinks brand owners to look for alternatives in the plastic field. In those early days a 48-cavity tool running in a 300-ton injection machine was the ultimate in production efficiency. At US$500,000 a tool it was also a costly proposition as the tools were running at cycle times of over 20 seconds. Much has changed since then and you would be hard-pressed to find a 48-cavity tool today running in North America and producing preforms for soft drinks or water. The Canadian company Husky Injection Molding of Bolton, Ontario pioneered the development of the specialized machinery and tools and has retained leadership ever since. In the eighties they developed 72 and 96-cavity tools running on 600-ton injection presses. Then came the introduction of three-station servo robots after earlier air-driven robots proved to be too slow. In this setup there are three sets of take-out tubes for one set of injection tooling.

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